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134 lines
3.3 KiB
C++
134 lines
3.3 KiB
C++
/* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file
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@brief
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Functions for discover of frm file from handler
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*/
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#include "sql_priv.h"
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#include "unireg.h"
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#include "discover.h"
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#include <my_dir.h>
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/**
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Read the contents of a .frm file.
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frmdata and len are set to 0 on error.
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@param name path to table-file "db/name"
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@param frmdata frm data
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@param len length of the read frmdata
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@retval
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0 ok
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@retval
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1 Could not open file
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@retval
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2 Could not stat file
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@retval
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3 Could not allocate data for read. Could not read file
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*/
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int readfrm(const char *name, uchar **frmdata, size_t *len)
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{
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int error;
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char index_file[FN_REFLEN];
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File file;
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size_t read_len;
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uchar *read_data;
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MY_STAT state;
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DBUG_ENTER("readfrm");
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DBUG_PRINT("enter",("name: '%s'",name));
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*frmdata= NULL; // In case of errors
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*len= 0;
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error= 1;
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if ((file= mysql_file_open(key_file_frm,
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fn_format(index_file, name, "", reg_ext,
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MY_UNPACK_FILENAME|MY_APPEND_EXT),
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O_RDONLY | O_SHARE,
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MYF(0))) < 0)
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goto err_end;
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// Get length of file
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error= 2;
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if (mysql_file_fstat(file, &state, MYF(0)))
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goto err;
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read_len= state.st_size;
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// Read whole frm file
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error= 3;
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read_data= 0; // Nothing to free
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if (read_string(file, &read_data, read_len))
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goto err;
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// Setup return data
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*frmdata= (uchar*) read_data;
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*len= read_len;
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error= 0;
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err:
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if (file > 0)
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(void) mysql_file_close(file, MYF(MY_WME));
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err_end: /* Here when no file */
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DBUG_RETURN (error);
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} /* readfrm */
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/*
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Write the content of a frm data pointer
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to a frm file.
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@param name path to table-file "db/name"
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@param frmdata frm data
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@param len length of the frmdata
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@retval
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0 ok
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@retval
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2 Could not write file
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*/
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int writefrm(const char *name, const uchar *frmdata, size_t len)
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{
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File file;
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char index_file[FN_REFLEN];
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int error;
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DBUG_ENTER("writefrm");
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DBUG_PRINT("enter",("name: '%s' len: %lu ",name, (ulong) len));
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error= 0;
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if ((file= mysql_file_create(key_file_frm,
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fn_format(index_file, name, "", reg_ext,
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MY_UNPACK_FILENAME | MY_APPEND_EXT),
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CREATE_MODE, O_RDWR | O_TRUNC,
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MYF(MY_WME))) >= 0)
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{
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if (mysql_file_write(file, frmdata, len, MYF(MY_WME | MY_NABP)))
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error= 2;
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(void) mysql_file_close(file, MYF(0));
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}
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DBUG_RETURN(error);
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} /* writefrm */
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